特征参数

Extract information based on the instantaneous features : In the center is one of the instantaneous rate of the power spectral density of the maximum, is a center to the absolute value of the instantaneous rate of the standard deviation, Non-zero weak signal instantaneous phase of the nonlinear component absolute standard deviation, Non-zero weak signal instantaneous phase of the nonlinear component standard deviation, In the center is one of the non-weak signal of the absolute value of the instantaneous frequency standard deviation, a signal to one of the instantaneous frequency of the power spectral density of the maximum, According to 16QAM and QPSK signals XI axis projection in the different performance parameters raised.

提取信号七个基于瞬时信息的特征：零中心归一化瞬时幅度功率谱密度的最大值，零中心归一化瞬时幅度绝对值的标准偏差，零中心非弱信号段瞬时相位非线性分量绝对值标准偏差，零中心非弱信号段瞬时相位非线性分量标准偏差，零中心归一化的非弱信号段瞬时频率绝对值的标准偏差，一个信号段的归一化瞬时频率功率谱密度的最大值，根据信号 QPSK 和16QAM在 XI 轴投影的不同表现，提出特征参数。

On the basis of it, fully utilizing reservoir prediction new means such as coherent data cube analysis and seismic attribute analysis etc. as to geophysical characteristic of fissure and carven development of carbonate reservoir and seismic reversion variation after hydrocarbon-bearing, combined with stress analysis, gradually summarized a set of auxiliary method of predicting the fissure and carven of carbonate reservoir to service exploration and development of the field.

在此基础上，根据碳酸盐岩储层缝洞发育及含油气后地震反射发生变化的地球物理特征，充分利用地震相干数据体、地震属性分析、特征参数反演等储层预测手段，结合应力分析，探索和总结预测碳酸盐岩储层的岩性和缝、洞发育情况的地球物理方法，用于油田勘探开发。

Fractal dimension of wood texture image can represent a lot of texture features, and it is an important characteristic parameter of timber species.

木材纹理图像的分形维数可以代表木材很多的纹理特征，它是木材树种的一项重要数字特征参数。

Combined with such characteristic parameters as chubbiness, fullness and intensity factor, etc., this process can automatically and adaptively choose the proper scanning pattern, moving speed of the platform and diving depth in according to the shape features of each layer and structural features. The process greatly enhances the prototype's building efficiency and consequently reduces the operation cost of RP machine.

为了能够在保证精度的前提下尽可能提高原型的制作效率，本文提出了自适应智能制作工艺流程的概念，结合饱满度、充盈度、强度因子等特征参数，该工艺能够根据层截面的形状特征及已原型固化部分的结构和强度，自适应地选择适当的扫描方式和托板的升降速度、下潜深度，极大地提高了原型的制作效率，从而有效地降低了成型机的运行成本。

Distinguishability and stability of each feature parameter extracted form the footprint outlines in this study are analyzed based on variance theory as a reference for feature selection.

运用方差分析理论，讨论了特征参数的个体差异性和同一稳定性，为足迹识别的特征选择提供了参考依据。

A gas permeation model associated with the structure of membrane and a method of determined membrane structure parameters such as tortuosity were established.

理论分析了疏水性多孔膜气体渗透原理和膜各种结构特征参数的关系，并建立了计算气体渗透通量的模型方程，以及确定多孔膜曲折因子等结构参数的方法。

The system is designed according to the mechanism of CAD Standard Part Graphies Files. SQL Server 2000 is selected as the host and construct the database of part liabrary due to characteristic parameter. STEP, viz. ISO 10303, is issued by international standardization organization, and here ,this paper gives the definition of product information model oriented part41 and part44 in STEP and six basic definienses which describe the product information to ensure the information in the product information model correct and shareable . This paper also presents method of creating and extracting product information on engineering draught and product data exchange and integration between CAD system and database manager system.

论文中采用&CAD标准件图形文件机制&，用SQL Server2000数据库建立了零件的特征参数数据库，完成了零件库的特性参数库建库工作；依据国际标准化组织的STEP标准即ISO 10303中的Part41，Part44两部分内容以及STEP标准中描述产品信息的六个基本的类库定义，提出了一种产品信息模型，保证了产品信息模型中信息的正确性和共享性，实现了工程图样中产品管理信息的建立和提取以及数据库系统与图形文件中的管理信息交换与集成。

The influences of fluidizing gas flow rate,pressure,pressurizing gas flow rate and total conveying pressure drop on the solid-gas ratio and the solid mass flow rate were investigated.

分别在不同的输送差压、充压风量和流化风量等条件下进行了输送试验，考察操作参数对煤粉质量流量和固气比等气力输送特征参数的影响。

Then, it established the testing system and achieved the experiment of collecting and simulating natural wind signal successfully. It validated the feasibility and reliability of the system through comparing the simulating signal and original one and offered the basis of control parameters and systemic feasibility for upper study.

而后建立测试系统，成功实现舒适性自然风信号的采样和还原模拟实验，通过对模拟自然风信号和原始信号各个特征参数的比较分析，验证了系统的可行性和可靠性，并为后期的研究提供参数控制和系统可行性依据。

Based on the method of neural network the relationship between the water demand ratio and the geometric and rheological characteristic parameters of fly ash was studied.

通过建立BP神经网络模型，处理了粉煤灰颗粒群特征参数(比表面积、形状因子、分数维、烧失量)和流变学参数(屈服应力、塑性粘度等)与其需水量比之间的关系。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。